问题
选择题
Not unti his fellows criticized him _______ to admit his mistake.
A．does he begin
B．did he begin
C．began he
D．had he begun
答案
答案：B
not until 位于句首，句子使用部分倒装。观察句子，从criticized可知句子应与过去有关，排除A；C答案为完全倒装。
点评：倒装分为部分倒装和完全倒装。要分清他们的概念及使用规则。